A duel is an engagement in personal combat between two characters.
为了荣誉而决斗
Rulers have access to a Duel interaction if they have 
War focus, 
membership in a Warrior Lodge, or a bloodline that "Enables dueling".
Unless the dueling game rule is set to "Unrestricted", the initiator must have one of the following reasons to challenge the target:
- Rivalry
- Foe (certain opinion modifiers toward the initiator, including "Cuckolded" and "Attempted Murder")
- Target is Excommunicated
; initiator is 
and same religion - Target is Decadent
; initiator is and Muslim - Initiator has a mission to duel target (Warrior Lodge quest)
Both characters must be in good shape to duel:
- Duelers are NOT inaccessible
- Duelers are NOT pregnant
- Duelers have NOT recently been in any duel (within 3 months)
- Duelers do NOT have the character modifier Bedridden or Severe Illness
- Duelers must each be at peace (for unlanded characters, this means that their liege must be at peace)
强宣称决斗
拥有 神圣之怒 DLC, 一位 部落部落统治者可以与另一个部落统治者决斗，以争夺一个 强宣称. 但有以下几个要求：
- 两位统治者必须是独立的或在同一阵营
- 此宣称必须超过挑战者的主头衔.
- 其他要求和机制与上面列出的挑战决斗要求相同
如果你输掉了一场强力主张决斗并死亡，而获胜者是你家族的成员，你可以切换到另一个角色。（这使得强宣称决斗成为在均分继承法分裂后巩固头衔的潜在有效方式。）
如果您是当前的头衔持有者，有人找你进行强宣称决斗，您可以选择拒绝决斗，但代价是获得 
.
Other duels
- Battlefield duels
Germanic men may get an event suggesting they challenge a disliked character to a Holmgang. Opinion must be below -40. Possible opponents are the liege, any vassal, or any fellow vassal.- Confronting a spouse's lover may result in a duel.
As a method of suicide, you may challenge a rival to a duel that you intend to lose. Unlike other methods of suicide, this is considered an honorable death.- When attempting to establish a warrior lodge bloodline, you will face a series of increasingly difficult duels.
Some event duels use different code to determine the outcome, but combat_rating_diff is generally a major factor.